chubbuck



@uitrit tutrs @anni @frn S. E. CHUBBUCK, OF ROXBURY, MASSACHUSETTS,ASSIGNOR 'lO JOSEPH H, GHADWICK, OF SAME PLACE.

Letters .Patent'Na 67,721, dated August 13, 1867.

i-lge (stimule :riant 1r in this: itlrrs vntrnt :mh mating part of thesame.

TO .ALLl WHOM IT MAY CONCERN:

Be it known that I, S. E. CHUBBUCK, of Roxbury, in the county ofNorfolk, and State of Massachusetts, have invented a new and useful'improvement in the Process of Manufacturing Sheet Lead; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to make and use thesame, reference being had to the accompanying drawings, forming part ofthisspecication.

A'Sheet lead is now most generally produced by milling or rollingleadplatesjof considerable thickness down to a quite thin sheet, the platebeing passed back and forth between prcssure-rollers until it iscompressed and` drawn out or reduced down to the required thickness, Theplates are formed by melting a requisite amount of pig lead, and pouringthe` same into a cast-iron .box or mould, the 'dimensions of which,internally, correspond to the desired size of the plate to be milled orrolled. Considerable dillienlty has hitherto been experienced in castingthese plutesfin consequence of the mould or box chilling the melted leadas it is poured into it, and causing the plate to have folds or seamsextending wholly or partially through it, which greatly deteriorate themilled or rolled lead, as the folds or seams do not unite underpressure, und the rolled lead frequently parts or separates, andsometimes will have holes in it.

My invention is designed to obviate this difliculty; and to this end itconsists in constructing the box orV mould with a steam-chamber, soarranged that the former may be heated to a proper temperature, in orderthat the melted lead, when poured into it, will not chill rapidly, orbefore the box or mould is filled, and thereby admit of the whole massin the box or mould cooling and forming a compact mass or plate.

My invention also consists in suspending the box or mould on pivots, andapplying gearing to the same, in such a manner that the box or mould,with the plato it contains, may be readily inverted, and the platedischarged with the greatest facility. In the accompanying sheet ofdrawings- Figure 1 is a vertical section of my invention, taken in theline x z, fig. '2.

Figure 2, a vertical section of the same, taken in the line y y, lig. 1.

Similar letters of reference indicate like parts. y

A A represent strong u'prghts, resting upon a suitable base, B, andhaving a box or mould, C, suspended between them by journals a a', thelatter being allowed to turn freely in the uprights. This box or mouldVis of rectangular form, and of a capacity requisite to 'admit of a plateof lead being cast of the required dimensions. Underneath the box ormould there is a cha'mber, D, into which steam is admitted through oneof the journals fa, both journals-being hollow or tubular, the steamescaping through the other journal a. The latter may be closed by asafety-valve, if necessary or desired. This steam-chamber keeps the boxor mould C in a Warm state, and effectually prevents the melted lead,when poured into C, from cooling before the same is filled. On thejournal a there is keyed a toothed wheel, E, into which a pinion, F,gears, the latter having-a tubular shaft, b, which is tted on an arm, e,attached to or projecting from one of the uprights A, the shaftl bhaving a crank, G, attached to it, for the convenienceof turning it.

By this means thebox or mould, when filled, may be readily inverted, andthe casting discharged from it upon a carriage placed underneath toreceive it. The box or mould, while being {illed with the melted lead,is supported in a. horizontal position by jacks placed one under eachcorner. These jacks are of corni-se removed when the box or mould is tobe inverted. i

I do not claim the suspending of the box or mould on pivots, for thathas previously been done for the convenience of inverting it todischarge the casting; but the gearing, so far as I am aware, has notbeen used to aid the operation; neither do I claim broadly the heatingof metal moulds; but, having thus described my invention, what I cla-imtherefore as new, and desire to secure by Letters Patent, is-

The improved machine herein described, for the purpose set forth. y

S. E. CHUBBUCK Witnesses Permits B. SMITH, Jr., A. PARKER NEWMAN.

